Abstract
Modified viscose rayon fibres were produced by incorporating different doses of polyamine/epichlorohydrin condensate in the dope. The modified fibres show excellent dyeability with heterobifunctional reactive dyes without electrolyte. The wash fastness and the light fastness of the modified fibres dyed with reactive dyes were good. The modified fibres also showed excellent dyeability on dyeing with different acid and metal‐complex dyes. The amount of additive present in the fibre was assessed from its nitrogen content and percentage exhaustion was found to increase with increasing quantity of additive. Tonal changes and increase in light fastness with acid and metal‐complex dyes have been attributed to the aggregation of dye in the fibre. Fibres containing more than 3% additive in the dope showed greater than 99% bacteria reduction on testing the antimicrobial activity against Escherichia coli and Staphylococcus aureus. It was observed that the antimicrobial activity deactivated on repeated washing using surfactants. The acid‐dyed fibres also showed a decrease in antimicrobial activity.
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